std::string 的begin到end是不包含 ‘\0’的
#include <iostream>#include <algorithm>#include <iterator>#include <string>intmain(){std::strings("Exemparl");std::next_permutation(s.begin(), s.end());std::stringc;std::copy(s.cbegin(), s.cend(),std::back_inserter(c));std::cout<<c<<'\n';// "Exemplar"} ...
xstring(4645): note: while compiling class template member function 'void std::basic_string,std::allocator>::_Become_small(void)' D:\GitHub\STL\out\build\x86\out\inc\xstring(3851): note: see reference to function template instantiation 'void std::basic_string,std::allo...
#include <iostream> #include <iterator> #include <string_view> int main() { std::string_view str_view("abcd"); auto end = str_view.end(); auto cend = str_view.cend(); std::cout << *std::prev(end) << '\n'; std::cout << *std::prev(cend) << '\n'; std::cout << ...
这些函数对通常无限定或有限定查找不可见,而且只能在 std::basic_string_view<CharT, Traits> 是参数的关联类时由参数依赖查找找到。 参数sv - string_view 返回值1) sv.begin()2) sv.end()注意提供这些函数,使得 std::ranges::begin 与std::ranges::end 能采用 basic_string_view 右值。它们默认拒绝右值...
std::cout << i << std::endl; } } int main() { auto p = alloc_vector(); assign_vector(p); print_vector(p); return 0; } #include <iostream> #include <memory> #include <string> struct connection { std::string ip; ...
这段代码是一个泛型函数loadVariant,用于从给定的SensorBaseConfigMap数据中加载特定键对应的值,并将其转换为指定的类型T进行返回。 该函数首先在数据中查找给定的键,如果没有找到,则会打印错误信息并抛出无效参数异常。 接下来使用constexpr和std::is_same_v来进行编译时条件判断,根据模板参数T的类型选择相应的处理方...
std::experimental::basic_string_view Member functions basic_string_view::basic_string_view basic_string_view::operator= Iterators basic_string_view::beginbasic_string_view::cbegin basic_string_view::endbasic_string_view::cend basic_string_view::rbeginbasic_string_view::crbegin basic_string_view:...
#include <iostream> #include <iterator> #include <string_view> int main() { constexpr std::string_view str_view("abcd"); constexpr auto end = str_view.end(); constexpr auto cend = str_view.cend(); static_assert ( *std::prev(end) == 'd' && 'd' == *std::prev(cend) and...
./test2.cpp:13:21: error: no match for ‘operator!=’ (operand types are ‘__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >’ and ‘char’) 13 | while(mid!=end&&mid!=sought) | ~~~^~~~ | |